Bobcat 741 - Page 348

ENGINE SPECIFICATIONS, 742 (Ford) (Cont'd)
All dimensions are given in inches. Respective metric dimensions are given in millimeters enclosed by parentheses.
Camshaft
Jourr:tal Diameter . ............ .. .................................... . .. . . . . .. 1.5597- 1.5605 (39,617-39,637)
Bearing 1.0 . ....... ..... .. . ..... . ................. . .... .... .. .. .. . ... ....... 1.5615-1 .5620 (39,662-39,675)
Length Front
& Rear ..... .. ..... ... .... . ... .. .. ....... ...... . ... ... . .... . . ......... .. . .. .... . . 2.26 (5 7 ,4 !
Center
........ .. ....... . .... . .. . .. ... . .. ... .. ....... . .. . .. ...... . . .. . ..... . . . .. ... . . . .. . '.' '.' 2.26 (57,4
Clearance .. . .. . .......... . .. .. ...... . . .... . .......... ..... . . 001- .0023 (0, 025-0 ,058) wear limit .003 (0 ,076
Bore for Bearing . .......... .. ... . .. . .... . . .......... . ... . .. .. ... ... ... . . . ... . 1.6885-1.6895 (42,888-42,9131
Oversize Bearing
O/S on 00 Standard 10 .. .. .. .. ........... .... ... . . .. .. . . . ..... . . . . . ...... . .. . .020 (0 ,513
End Play . . ...... ... . . . . . ..... . ... ..... . .. . ... ... ... . . .. ..... .. . ... .. . . . .. . ...... .0024-.075 (0 , 061-0 ,192
Thrust Plate Thickness ....... . .. .... . . . ............. . . . . .. ... . ....... .. . . .. . ...... 1755-.1775 (4 ,458-4,509
Valve Timing -
Inlet Opens - °BTDC . . . ... . . . . ........... .. ................... . .... ... .... ... ... . ........... . .... . 17-21
Inlet Closes - °ABDC . . . ...... . ..... . ... . .. .. ... ..... .. ...... . .. ........ .... . ............... .. .. . .. 51 - 55
Exhaust
Opens - °BBDC ... ....... . .. .. ... . ... . .......... . .. .. .. .... .. .. . . . . . . .. . ... . .. . .. ... ... . .. 51 -70
Exhaust Closes - °ATDC ...... . ... . . ... .. . .. .. ... . .. . .. .... . .. ...... ... ........ ... ........ .. , .. . . .. 17-22
Inlet Cam Lift .: .. .. . .. . . ..... .. . ..... . ..... . ..... . ..... . . . .. . .. ........ . 0.2108-(5,3548) - 0.2356 (5 ,9851)
Exhaust Cam
Lift ...... . ......... .. . . ........... . . . ...... . ...... .... ..... 0.2176 (55,5276) - 0.2321 (5 ,8943)
Crankshaft
Main Bearing
Journal Diameter . . . .. . ...... . . . . ... . .... .. . ...... . . . .. .... ... . ... 2. 1253-2 . 1261 (53,983-54,003
Main Bearing
Clearance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .0005- .002 (0,013-0, 051
Rod Bearing Journal Diameter .. . .... ...... . ... . . . .. . . ... .... . . . . .. . ..... . . . .. 1.9368-1.9376 (49,194-49,215
Rod Bearing Clearance . ... .. . .. .. ........... . .......... .... ... . . . . . . . .. .. .. .. . ... .0005- .002 (0 ,013-0,051
Main & rod Bearing Journal -
Max. Taper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.. .003 (0 , 008~
Max. Out-of-Round .... .. . . ... . .. .. . . . .. ........ . .. ... .. .. ...... ... . .. .. .... .. ...... .. . . ... .0004 (0 ,010
Crankshaft End Play . . . ........ ... ................. . .... . .... . ...................... . .. 003- . 011 (0 , 08-0 ,28
Bearing Wall Thickness-Standard .. ... . . .. . .. . ... . .......... . . .. . . . . ..... . .... . . .. . 0719- .0722 (1 ,788-1 ,796)
For every
.002 (0,051) undersized thickness add .001 (0 ,026) to standard thickness.
Thrust Washer
... . . .. . .. 0.091-0.0093 (2 , 31-2 ,36) Std. 0.002 (0,0508)-0.005 (0,127) 0.007 (0,1778)-0.010 (0,254)
The crankshaft and
cylinder block are color-coded for installation of the correct bearing AT THE FACTORY.
Use a micrometer to measure the inside diameter and the outside diameter of the bearing surfaces so that correct
replacement bearings can be ordered.
Connecting
Rod
Piston Pin Busing 1.0 .... . ... . . . . . . . .. .. . ....... . .. . ... . . .... ..... . .... . ... .. .... 8121 -. 8125 (20,627-20,638)
Connecting Rod Bearing Bore .... . .. . ... . ..... .. . ............... . .... . ..... .. ... 2.0825-2.0830 (52,90-52, 91 )
Connecting Rod Length Center to Center
.. . .. . ............ . .. . .............. . 3.9265-4.9295 (125 ' 133-125 ' 209~
Side Clearance . ... . ................... . ..... . ........ . ........ ... .. . .. . . . .. . . . .. .. . . 004- .010 (0 , 10-0 ,25
Max. Twist or Bend ........... . .............. . . ... .. . ....... ... . . . . . .. ....... ...... . . . . .. .. . . . . .004 (0 ,10
Pin bushing and crankshaft bearing bore must be parallel and in the same vertical plane within the specified total difference
at ends of 8 inch
long bar measure 4 inches on each side of rod .
Piston
Diameter
.. . . . . . . .. . .. ..... .. ... . . . . .. .... . ..... . . ...... ...... . .... . . .. . . ... 3. 1853-3 .1877 (80,907-80, 967 !
Piston
to Bore Clearance .... .. . . .. . ... . ... . . . ... .... .. . . . . ... . .. . .. .... ...... . 0016-.0025 (0,04064-0,06350
(Measure 90° to pin centerline and at bottom of pin
(Clearance 90° to pin centerli ne and at bottom of pin
Clearance between Deck and Piston Crown at TDC . . ... . .................... .. .... .. . .. . . 025- .043 (0,63-1 ,09)
Piston Pin
Diameter . . .
'.' : . . '.' . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . 8119- .8123 (20 , 622-20 , 632 ~
Interferenc~ Fit In Plsto.n ... . .......... . .... .. . ............... . .. . . . ... . . ... ... . ... 0001 -. 0003 (0 , 003-0 ,008
Clearance
In Rod Bushing ....... . . . ... . ..... .. .. .. . .... . .. .... ... ... .. . .. .. ...... . 0001- .0003 (0 , 003-0 ,008
-88-5-
741, 742, 743 & 7430S Bobcat Loader
Service Manual